Raid1: sdb has a lot mor work then sda

[Daniel Spannbauer <ds@xxxxxxxx>]

Hello,

at the moment I'm trying to find a bottleneck on my lamp-server with
opensuse 11.4 (Kernel 2.6.37.6)

Sometimes the system has a very poor performance because of a high io-wait.
If I watch the systems disk-access with "atop -dD" I can see that sda is
the most of the time at a load of 10%, sdb sometimes is at 100% or
higher at the same time.

In my opinion in a Raid1-System both disk should have nearly the same load.

Or may I wrong whis this?

Both harddisks where changed 3 Weeks ago, /proc/mdstat shows that the
rebuild was successfull and the array is functional. Today I've changed
th SATA-Cable and the Port on the Maindboard of sdb, but the behaviour
is still the same. Both disks passed the extended smart-self-test.

Any ideas about that?

Regards

Daniel



-- 
Daniel Spannbauer                         Software Entwicklung
marco Systemanalyse und Entwicklung GmbH  Tel   +49 8333 9233-27 Fax -11
Rechbergstr. 4 - 6, D 87727 Babenhausen   Mobil +49 171 4033220
http://www.marco.de/                      Email ds@xxxxxxxx
Geschäftsführer Martin Reuter             HRB 171775 Amtsgericht München
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